Abstract
The absorption spectra of solid films of six photoconductive dyes are reported. The transitions in the solid state correspond to those of the ``isolated'' cations in solution. However, the longest-wavelength singlet-singlet absorption band is split into components separated by 1000 cm—1 or more. Other bands are unaffected, except for a general decrease of oscillator strength. The results are interpreted in terms of light absorption by a single molecule, followed by exciton motion in the lowest excited state.
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